Introduction to Semaphore

[@TutorialsPoint_]

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[@yanmoenaing71]

Incredible Indians !!!!!!!!!! No topic that the Indian don't teach !!!! Nearly all of the Indian instructors I have learnt from are good at representing the difficult questions with simple examples and explanation. Thank you Sir.

[@81asimayub]

The best analogy that comes to my mind is that or the sign on an airplane toilet. When it is vacant the sign is green, as soon as someone enters and locks the door the sign turns red. Which means all other people queue up. When the person leaves the toilet the sign changes to green, and one of the members of the queue enters, turning it back to red, while people in the queue wait for their turn.

[@OwzaB]

The way you make it seem so simple. Thank you, sir, I love your explanations.

[@Engineerblogbihar]

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[@HumaRizwan]

well explained SIR.........Who else watching in 2020?😀

[@jayaadityathota6886]

😂😂😂Ss...

[@nayeemparvez5471]

still in 2020 😁

[@vipinkg6124]

2021😎

[@konstantinrebrov675]

I like this professor. He is calm and relaxed. I feel like he not only has surface level knowledge, but deep knowledge as well. He veda it.

[@mritunjay7065]

Sir, your superb explanation in shortest time is awesome!

[@hasanfuad6631]

Wonderful, Superb, Mind blowing explanation Sir. Love from Bangladesh.

[@spaceman1861]

Firstly you have an amazing way of talking, Secondly great content!

[@raphulali8937]

i am not someone expert i just learned it from my teacher that ..in that while loop you should have a semicolon after s

[@aymanaitelaouad5015]

What an incredible accent Just woaaaah

[@ioanadobos2840]

Thank you, sir, really helpful!

[@Engineerblogbihar]

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[@vashmchannel7266]

Please on captions for every video which u generated...

[@spencer5810]

thank you this video was very helpful

[@ahmadjaradat3011]

well explained SIR

[@mohokhachai]

Thanks

[@fareeharazaq7054]

Thanks for having short video😃

[@AhmedMohamed-ke1bn]

Thank you so much

[@amitabhsrivastava5654]

Nice thank you

[@--sql]

Why not just have a function that takes a process and the delegate (critical section) as parameters which puts all the processes into a queue and sends a signal to the next process in the queue after the critical section is complete? This will allow you to put all the processes to sleep instead of busy waiting.

[@brd8764]

Critical situations. Entry is restricted.

[@pramodkarmca]

@7:29 , Not able to understand, After some time, how Process p1 will come.please comment @Tutorials point

[@hadihaidar6059]

it was in the ready queue waiting to get its share of the cpu

[@050zaher]

thanks alot ❤👏

[@abirhalouani1800]

Thanks 😃

[@oghenekparoboonokwakpor3051]

how can i get an accurate description i dont speak india

[@lakshshergill9637]

very detailed lectures .....thanx sir for uploading

[@GemaPratamaAditya]

nice example

[@SivaSiva-bq6vd]

Hi

[@GemaPratamaAditya]

@@SivaSiva-bq6vd banana

[@saikumaryeruboina697]

Good explanation sir..👏👏👏

[@monsterking288]

Hi

[@raghulmani2150]

Wooow

[@sdrmuneeb]

When will S go less than zero? :|

[@JyotiKumariURCS]

nice explanation.

[@sujeetbaranwal9085]

Dear sir, I am looking at the up & down implementation of linux semaphores. A good descritpion is also given at : [url]0xax.gitbooks.io/linux-insides/content/SyncPrim/linux-sync-3.html[/url] my understanding is that the spin_lock() & spin_lock_irqsave() are used when contention is between threads AND between thread and IRQ handler respectively. in case of up() & down(), the sempahore struct is protected using spin_lock_irqsave() and not spin_lock()! My understanding was that we dont make blocking calls like down() form irq context. does it mean that because IRQ handler form IRQ context can call up(), we need to protect this "semaphore" struct from concurecny, thats why we use spin_lock_irqsave()? Please help understand. Thanks Sujeet

[@whisgr]

love how he pronounces zero as gero :D

[@SanjaySingh-ce6mp]

Shaadi krle

[@fk8607]

Good one

[@monsterking288]

Hi Siva

[@stingpandey8646]

Thanks sir

[@kunalprasad6898]

how you will same semaphore variable in 2 different process? Are you saying you will be having IPC call (shared memory or TCP/IP) to update the variable? I am saying from the concept of mutex. As we need to have same mutex variable in both the thread so how you will have same variable in 2 different process?

[@Rajat-il6kp]

well that's the semaphore for you.The semaphore lies in location which multiple processes can access to maintain synchronization

[@tausid979]

Sir tell me one thing, in your given example why process P1 not started with Wait : .... Critical condition: ..... Signal : ..... You just just took your way, u did not followed the process of semaphore, Please clear my doubt

[@randomtv3982]

zero not gyro

[@jexinhenry]

It doesn't matter as long as you understand.

[@onkarkalpavriksha8676]

very bad explanation!

[@siretenergy5539]

thank u sir

[@rahulshetty3849]

Thank you sir